package offer;

/**
 * <p>
 * 剑指 Offer 44. 数字序列中某一位的数字
 * </p>
 *
 * @author xiaozuolin
 * @date 2021/9/24 17:44
 */
public class Offer44 {
    public int findNthDigit(int n) {
        int digit = 1;
        long start = 1;
        long count = 9;
        while (n > count) {
            n -= count;
            digit += 1;
            start *= 10;
            count = digit * start * 9;
        }
        long num = start + (n - 1) / digit;
        return Long.toString(num).charAt((n - 1) % digit) - '0';
    }
}
